Machine for turning crank-pins.



W. E. ANDERSON.

MACHINE FOR TURNING GRANK PINS. APPLIoATIoH HLED JULY 11.1907.

Patented Mar. 30, 1909.

' l 4 zsHBBTssHnET W. E. ANDERSON. MACHINE POR TURNING GBANK PINS.APPLICATION FILED JULYll, 1907.

916,646. Patented Mar. 80, 1909. j 2 BREW-SHEET 2. 4 j 9'( M Id j UnirWALTER E. ANDERSON, OF LOS ANGELES, CALIFORNIA..

MACHINE FOR TURNING @RANK-PINS.

Specification oi Letters Patent.

Patented March 30, 1909.

Application filed July l1, 1907. Serial No. 383,324.

To all 'whom it may concern.'

Be it known that I, VALTER E. AnnunsoN, a citizen of the United States,residing at Los Angeles, in the county of Los Angeles and State ofCalifornia, have invented a new and useful Machine for Turning Crank-Pins, of which the following is a specilication.

This invention relates to a machine .for turning crank pins, and theobjects of the invention are to provide a machine of the characterdescribed which is compa atively simple in construction, eii'ective inoperation, and which can be applied to a lathe of any well known typewithout material alteration of the lathe.

Another obect is to provide for turningcrank pins on a shaft having'cranks set at 120 degrees or any degrees apart.

Another object is to provide for removing the crank shaft after one pinhas been turned and replacing the crank shaft in the machine in positionfor turning the next piu without resetting the machine, thereby insuringthat the pins will all be turned in line and have the same throw.

Another object is to provide means for quickly setting the machinewithout making measurements to turn a pin on a crank of any desiredthrow within the limits of the machine.

Another obj ect is to provide an improved centering device and means formore securely clamping the crank in position.

Other objects relate to details of construction and arrangement whichwill be hereinafter described.

Referring to the drawings :*Figure l is a plan View of a lathe equippedwith the invention, a crank shaft having three cranks being shown inposition ready for turnino'. Fig. 2 is a front elevation of what isshown in Fig. l. Fig. 3 is a section on line ac3-4:3 Fig. l. Fig. 4 isan enlarged section on line m4*m4 Fig. 6. F ig. 5 is a section on line:aL-m5 Fig. 4. Fig. 6 is a section on line c-6 Fig. et.

l designates the lathe bed having ways 2 upon which is mounted theapparatus comprising the invention. The apparatus consists of two ormore units. For example, if a single throw crank pin is being turned,only two units would be employed which would be ,constructed right andleft, while if the crank was a long crank shaft or had two or morecranks, a third unit would be employed as indicated in Figs. l and 2.inasmuch as these units are similar in construction, one only will bedescribed.

Figs. 1lto 6 show the detailed construction of a unitwhich comprises acircular casing 3 which consists of two members Ll and 5, bothsubstzstially the same in construction except that the casing 5 has abroad foot which is grooved on its under side and slidably mounted onthe ways 2 of the lathe, be-

ing adjustably held in position thereon by a' clamping plate G fastenedby bolts 7. As clearly shown in Fig. 5, 'the casing fl at the bottom hasa foot 8 which rests in a seat formed in the casing 5 and a key 9 locksthe member el against lateral movement on the member 5, and an annularspace or groove .l is formed between the edge of the member -t and ashoulder on the member 5. The two members l and 5 are not continuousrings but cach have a segmental gap at the top which is bridged by a capll, the latter serving to space thc two members i and 5 apart at the topand also to hold them together and when in place makes them in cffecteach a complete ring, the cap l1 being grooved to form a continuation ofthe groove lO. rlhe members il and are further prevented from spreadingby intermediate straps l2 which are bolted to the members atdiamctrically opposite points, as shown in Figs. et and G. Each member 4and 5 is provided with a lug or bracket 13 forming a journal for a shaftle. rl'he shaft 14, as shown in Figs. l and 2, extends parallel with thelathe, and its head end is mounted in thc bracket l5 which is attachedto the head of the lathe, the shaft 14 having a pinion 16 which mesheswith the usual large gear 17 on the lathe spindle.

Mounted between the two lugs 13 of the associated members et and 5 is apinion 18 splined on the shaft l-'l which permits the unit to be shiftedalong the lathe bed to the position desired.

lilounted to rotate in the members l and 5 is a chuck designated, ingene al, 19 which comprises a disk having on its periphery an externalgear 20 which rides in the groove l0, the ends of the teeth clearing thecap ll and solid portion of the member 5 as shown in Fig. -l-, and thegear 2O meshes with the pinion 18 and is revolved thereby. The chuck 19has a radial slot 2l which extends more than half way through the disk,as clearly shown in .F ig. 4c, and each wall of the lli) slot 21 isprovided with a way 22 and at intervals notches 23 forming seats areformed transversely at the edges of the slot 21, as clearly shown inFigs. s and 5. rEhe slot- 21 is bridged and closed by a cap 24C which isdetachably secured in place by bolts 25, and the outer face of the cap211 is provided with teeth to complete the gear 20. Slidably mounted inthe slot 21 on the ways 22 is a pair of jaws and 2.7, each jaw having aV-shaped recess to receive and clamp the shaft designated 28 by dottedlines in Fig. l, the crank pin being designated 29. A. bridge bar 30which is adapted to be received in any of the seats 28 is provided and apair of adjusting bolts 81 with lock nuts passed herethrough and enterthe seats in the inner aw 2T and serve to adjust the inner jaw, whichadjustment may be facilitated by providing graduations on the disk 19adjacent the ways To clamp the jaw 27 in place after it has beenadjusted, clamping bolts 3S are provided which are screwed in the jaw 27and pass through slots 3&1 formed in the raised walls on each side ofthe slot 21, see Figs. 5 and 6. ly employing several seats 23 it ispossible to adjust the bridge bar 3() to shift the 2'4"' to variouspositions for different throws of cranks, and the length of theadjusting screws 31 is sufficient to enable the jaw 27 to be adjusted toany peint along the slot 21. rlhe jaw 27 is also provided with an eXtraset of threaded holes 85 which enables the jaw to be shifted to engagewith bolts 83 when the latter reach the ends of their slots. rlhe outerjaw '26 is connected with the inner jaw 27 by bolts 36, by means ofwhich the crank shaft 28 may be clamped between the two jaws, and inclamping the same in place the inner jaw 27 is first set in the properposition which may be readily determined as above described, and thenthe outer jaw 26 is screwed into place.

In order to positively hold the crank shaft from swinging around in itsseat between the jaws 26 and 27, means are provided between which thecrank may be received and clamped to hold the crank pin 29 concentricwith the chuck. This means comprises a pair of clamping screws 3Tarranged on opposite sides of the slot 21, each clamping screw 37 beingthreaded in a bracket 38 and each clamping screw 3"( being provided witha lock nut. The brackets 38 are secured adjustably in place by two bolts39 and a third bolt 10, see Figs. a and 6, the heads of bolts 39 slidingin under-cut slots l1 and the bolt e0 sliding in an under-cut slot 42.The bolts 39 and 40 hold Vthe bracket 38 down fiat against the disk 19and in a measure prevent the bracket 38 from sliding, but to positivelyinsure the bracket against slipping, a series of seats 43 are providedas clearly shown cesses,

in said recesses, two clamping in Figs. l and 6, and key L14; whichengages in the seat in the bottom of the bracket 3S is adapted to engagein any of the seats e3. By this means the bracket 3S may be roughlyadjusted, after which the screws may be screwed up to give the finaladjustment and clamping of the crank to bring the crank pin 29 in acentral position. ln case a crank pin is being turned which is mountedon a disk instead of on straight bars, as shown, the disk of the crankmay be clamped tc the chuck 19 by bolts and plates not shown, whichbolts may be engaged with any of the under-cut slots in a manner similarto which work is clamped to the face plate of a lathe or to the table ofa drill press.

ln operation, the units being assembled on the lathe bed, the crankshaft is inserted in the slots 21 by first removing the caps 11, 21 andouter 27 being set to the desired point the shaft is clamped in place intwo of the adjacent units as shown in F ig. 1, the caps 11 and 21 beingreplaced. 1n lfig. 1 t-he eXtreme right hanf unit acts as a steady restto support the outer end of the shaft. he ordinary carriage and toolpost, not shown, are Miounted as usual on the ways anl lie between thetwo left hand units, and the shaft 1s being revolved through the mediumof gears 16 and 17 in turn imparts rotation to the chucks through themedium of pinions 1o and gears 20, thus driving the crank shaft androtating the pin to be turned on the center line of the lathe. The righthand unit, it will be observed, also acts to drive the crank shaft inaddition to performing its function as a lsteady rest.

What I claim is 1. In a crank pin turning machine, a bed, a radiallyslotted disk rotatably mounted thereon, the sides of said slot beingprovided with cppositely disposed pairs of rea bridge piece adapted tobe removably seated in said recesses, and clamping means adjustablyconnected with the bridge piece.

2. ln a crank pin turning machine, a bed, a radially slotted diskrotatably mounted thereon, the sides of said slot being provided withoppositely disposed pairs of recesses, a bridge piece adapted to beremovably seated jaws adjustably seated in said slot, one of which isadjustably connected with the bridge piece, and means for locking thelast mentioned jaw in its adjusted position. I

3. ln a crank pin turning machine, a work driver adapted to be clampedto a lathe, and comprising a disk with a radial slot, the walls of whichare each provided with a series of notches, a bridge-bar adapted to seatin the notches, a pair of jaws slidable in the slot, adjusting screws inthe jaws 26, and the inner jaws bridge-bar engaging the inner jaw,clamping bolts engaging the inner jaw and slidable in slots in the disk,clamping bolts con necting the inner and outer jaws and means forrotating the disk.

Ll. In a crank pin turning machine, a Work driver comprising arotatable, radially slotted disk having raised walls at the sides ofsaid slot, said walls being slotted longitudinally at right angles tothe radial slot, inner and outer clamping jaws adjustably mounted insaid radial slot, means for adjusting said aws, bolts through the slotsin said walls engaging with the inner jaws for holding them after theyhave been adjusted, and means for rotating the disk.

5. In a crank pin turning machine, a work driver adapted to be clampedto a lathe, and comprising a disk with a peripheral gear and having aslot closed by a removable gear section, jaws slidable in the slot forclamping the crank shaft, a casing in which said disk revolvescomprising two rings with segmental gaps, a cap closing both gaps, therings forming an internal annular groove which receives the gear of thedisk, and straps connecting the two rings at diametrically oppositepoints.

6. In a crank pin turning machine, a work driver comprising a casing, adisk revoluble in the casing and having a radial slot, jaws slidable inthe slot, the disk having undercut slots extending at right angles tothe iirst slot, brackets with bolts engaging the underl cut slots, andclamping screws in the brackets for engaging the crank.

7. In a crank pin turning machine, a work driver comprising a casing, adisk revoluble in the casing and having a radial slot, jaws slidable inthe slot, the disk having undercut slots extending at right angles tothe irst slot,brackets with bolts engaging the under cut slots, clampingscrews in the brackets for engaging the crank, key seats in the disk,and a key in each bracket adapted to engage in the key seats.

8. In a c ank pin turning machine, a work driver comprising a casingslidable on a lat-he bed, a disk in said casing having a main slot toreceive the crank shaft, and jaws on said disk for clamping the crankpin to the disk, the disk having slots parallel with the main slot,bolts extending through said slots and engaging the inner jaw, the innerjaw having extra pockets threaded to receive the latter bolts.

9. driver for a crank pin turning machine comprising a rotatable diskhaving a shouldered, radial slot extending from its periphery to a pointpast its center and having parallel, undercut slots in its face adjacent to and parallel with the inner end of said radial slot andoppositely disposed undercut slots adjacent to the center of the diskand at right angles to said radial slot, a portion of said lastmentioned slots being provided with seats.

In testimony whereof, I have hereunto set my hand at Los Angeles,California, this 3rd day of July 1907.

vWALTER E. ANDERSON. In presence ot'- GEORGE T. HACKLEY, FRANK L. A.GRAHAM.

